Commandant Rivière class of frigates was built for the French Navy in the early 1960s. Four similar ships (the João Belo class) were constructed for Portugal. Originally equipped with three 100 mm guns, one gun was later replaced by 4 MM38 Exocet Missiles. Nine Commandants were built, with three eventually transferred to Uruguay, where they remained in commission until the early 90s.
Two versions of the model are available. The "A" version has the three 100mm guns, the "B" version has Missile tubes. There may also be a variant without missile tubes and with the lower rear gun removed, but either the "A" or "B" version can be easily converted to this with a nail clipper and file. :-)